It's called a gunblade. [ Which is quite straight-forward in explaining what it is, though someone could see that simply by looking at it. Thancred does make another note of the general level of technology of Byleth's world, however, and glances over to ask: ] Only turrets and cannons where you're from?

[ An innkeep sounds like a reasonable place to start, and so he gestures for Byleth to lead the way. He knows where the inns in the town are located, having mapped the place out a number of times by now, but he won't bother to guess at which one she's referencing. ] If that doesn't work, we can try the taverns. There's bound to be gossip there as well. [ And, because curiosity and information gathering go hand-in-hand, he also asks: ] — Why does he owe you a favor?